pa populations

Individuals living in the same area are referred as local populations. They all experience similar ecological processess at a particular stage of the life cycle. Similar populations of a species occupying different geographical areas are called sister populations. ..

. Sigmoid growth curve is formed of five phases. a) Lag phase b) Positive acceleration phase c) Logarithmic or exponential phase d) Negative acceleration phase e) Stationary phase. a) Lag phase - Period where individuals adapt to the new environment. b) Positive acceleration phase - Period of ..

Malthus' Theory of Population - A British economist Malthus'(1778) proposed a theory that population grows at geometric proportion and after the imbalance between population and resources is set in, population is automatically checked by natural disaster..

A British economist Malthus'(1778) proposed a theory that population grows at geometric proportion and after the imbalance between population and resources is set in, population is automatically checked by natural disasters (like famine, epidemic, disease, earthq..

A drastic change in the environment destabilizes or even exterminates a population. Natural calamities such as earthquake, volcanic eruptions etc. cause drastic changes in the environment leading to the destruction of the resource..

A biosphere reserve preserves a) wild population b) life style of tribals c) genetic resources of domesticated plants and animals. It helps in 1) conservation 2) promotes economic development 3) Scientific research, monitoring and educati..

Since a biotic community is formed of a large number of diverse type of populations of plants and animals and microbes, all these populations are essential for biotic stability. By definition 'biotic stability is the absence of any major fluctuations in the population ..

A sigmoid curve is characterised by a lag phase (wherever the growth rate is negligible), positive acceleration phase (wherever the growth rate is moderate), logarithmic phase (where in the growth rate is high) and negative acceleration phase (where in the growth rate is 0)...

a) Local species diversity is directly related to the efficiency with which the predators prevent the monopolization of an environmental area by any species. b) Predation keeps the prey population under check, so as to maintain an ecological balance. c) Weak and less efficient membe..

Characteristics of Biotic Community - A stable and self sufficient community has certain specific characteristics. a) Habitat Biotic community occupies particular area with specific physical environment, which acts as a limiting factor, regulating the population size of various speci..